// 生成uuid
export function uuid() {
  function S4() {
    return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
  }
  const str =
    S4() +
    S4() +
    "-" +
    S4() +
    "-" +
    S4() +
    "-" +
    S4() +
    "-" +
    S4() +
    S4() +
    S4();
  return str;
}
